Dust-collector.



No. 64|,68L Patented `ian. 23, |9130.l E. R. DRAVER.

DUST COLLECTOR.

(Application med Nov. 5, 189s.)

(No Model.)

zfm f @n/wwf Nifrnn STATES PATENT Fries.

EMIL R. DRAVER, OF STILLWATER, MINNESOTA, ASSIGNOR, BY MESNE AS-SIGNMENTS, OF ONE-HALF TO MARIE L. DRAVER, OF SAME PLACE.

DUST-COLLECTOR.

SPECIFICATION forming part of Letters Patent No. 641,681, dated January2S, 1900.

Application filed November 5, 1896. Serial No. 611,185. (No model.)

T0 all whom t may concern.-

Be it known that I, EMIL R. DRAVER, a citizen of the'United States,residing at Stillwater, in the county of Washington and State ofMinnesota, have invented certain new and useful Improvements in Dust-Collectors; and I do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

My invention relates to dust-collectors of that type known to the tradeas tubular dust-collectors, and has for its object to improve theconstruction with a view of increased efficiency.

To this end my invention consists of the novel devices and combinationsof devices hereinafter described, and defined in the claims.

Like notations refer to like parts throughout the several views.

Figure 1 is a central longitudinal section through my improved machineas organized for use as part or in connection with a middlings-puriiier,with some parts broken away and others removed. Fig. 2 is a verticalcroisssection on the line :r2 m2 of Fig. 1. Fig. 3 is a plan view ofsome of the parts shown in Figs. 1 and 2, with some portions of theparts shown in horizontal section on line ac3 m3 of Fig. 1. Fig. 4 is adetail of some of the parts shown in Fig. 2 on the same section-line asFig. 2, but on a larger scale, with some'portions broken away; and Fig.5 is a detail in vertical section, taken longitudinally through aportion of the machine,0n a larger scale than Figs. 1, 2, and 3, forshowing the relation of the traveling parts to one of thecollectingtubes and the cell within which the same is mounted.

The numeral 1 represents the main frame or casing of themiddlings-puriiier. The numeral2 represents the feed-hopper, 3 thefeedroll, and l one of the sieves of the purifier, all of which partsare of the ordinary standard construction.

The numeral 5 represents the main section of the closed or tight wallchamber above the sieves of the purifier.

The numeral 6 represents the clean air chamber at the top of themachine.V

The numerals 7 and 8 represent, respectively, the fan and fan-case,shown as mounted in the top wall of the machine, and which fan is of theproper construction to operate as a suction-fan for producing forcedcurrents of air through the machine.

The numeral 9 represents a series of transverse partitions connected byend pieces 9a, which partitions 9 are spaced apart from each other atsuitable distances to form a series of cells 10, supported from the sidewalls of the machine. The said cells 10 are open at their, upper ends,but are closed at their lower ends by flexible bottoms composed of acentral board or plate 11 and strips 12, of canvas or other flexiblematerial, connecting the said board 11 to the lower ends of thepartitions 9. The said bottom board 11 is perforated or provided withholes 13 of the proper size to receive the lower ends of a series ofcollectingtubes 14,' which are mounted in the cells 10. The said tubes14 are made of annel or other suitable material adapted to serve as acollecting-surface and are closed at their upper ends by a common headorcap board or plate 15, iixed at its ends to the side walls of thechamber 5 and serving to suspend the collecting-tubes 14 in properworking positions. The lower'ends of the tubes 14 are open and aresecured to the walls ofthe holes 13 in the bottom plate 11. The canvasor ilexible sections 12 of the cell-bottoms are made sufficientl y slackto permitan up-and-down movement of the bottom plate 11 for .rapping orshaking the tubes by means which will be presently noted.

. Directly over the entire series of cells 10 are mounted chains 16,vprovided at one or more points with cross-slats 17, connected by canvasor other imperforate iiexibl'e material 18 for coperation as a travelingcutoff device to close the upper ends of the cells 10 one after theother in succession. The flexible body 18 is preferably applied to theouter faces of the slat 17, as shown best in Fig. 5, so as to preventend openings between the slats 17. The chains 16 are of the properconstruction for cooperation with sprockets 19 on transversesupporting-'shafts 20, one of which receives motion in any suitable way.Below the series of cells 10 are mounted corresponding chains 21, whichhave attached IOO thereto at the proper point transverse slats 22 and abody of canvas 23 or other flexible material, which parts cooperate toform a traveling dust-receiver and partial cut-off device for the lowerends of the collecting-tubes let. The said sprocket-chains 2l are 1nounted on sprockets 24, fixed to transverse shafts 25, one of whichreceives motion in the proper direction from any suitable source. Thesocallcd traveling cut-off, which is movable over the top of the seriesof cells 10, and the so called traveling dust receiver, which movesunderneath the series of cells, are mounted to travel together or sothat the cutoff device will be directly over and will span the top ofany given cell 10 when the dustreceiver is directly underneath andspanning the lower end of the cell.

rlhe bottom boards or plates 11, to which the lower or open ends of thecollecting-tubes 1t are secured, extend outward beyond the end walls ofthe cells 10 and are subject, as shown, to the action of springs 2G,reacting between the upper faces of said boards or plates, andangle-brackets 27, fixed to the side walls of the chamber 5, as bestshown in Fig. et. The said plates or bottom boards 11 are also providedon the under surfaces of their outer ends with cam-blocks 28 forcoperation with reversely-set cam-blocks 29, carried by thedust-receiver, as best shown in Figs. 4 and 5. The delivery end of thetraveling dust-receiver overrcaches the mouth or upper end of anolf-leading spout or chute 30 for conducting away the dust deliveredthereto by said traveling dust-receiver, as shown in Fig. 1. The lowerend of the chute 30 is shown as provided with a gravity-gate 31.

It has not been deemed necessary for the purpose of this case to showall the driving connections for all the movable parts of the purifier;but the driving connections for imparting the required motion to thetraveling cut-off device andthe traveling dust-receiver are obvious froman inspection of Fig. 2. One of the sprocket-shafts 20, which supportand drive the traveling cutoff device, is shown as provided at one endwith a sprocket or pulley 32, which receives motion from some movablepart of the purifier through any suitable connections. (Not shown.) Atits opposite end the said driven member of said shafts 2O connects by apair of miter-gears 33 with a vertical shaft 34, which in turn connectsby another pair of miter-gears 35 with one member of the sprocket-shafts25, which support and drive the traveling dust-receiver. Through theseconnections the traveling cutoff device, movable over the top of thecells 10, and the traveling dust-receiver, movable under the lower endsof the said cells, will be driven together in the proper directions forthe desired cooperation of the cut-off device and the dust-receiver. Thesaid traveling motion of the said cut-off device and d ustreceiver is avery slow one.

Having regard now to the action,it is obvious from an inspection of thedrawings that all of the cells 10 and all the collectingtubes 14 will beconstantly subject to the suction from the fan 7, except the particularcell 10 and series of tubes 14 therein which at the given time aresubject to the action of the cut-off device and the dust-receiver. Inthis particular cell and the collecting-tubes suspended therein theforced currents of air will be cut od. Otherwise stated, whenever thetraveling cut-off device spans the top of any given cell 10 the forceddraft therethrough will be cut otf, thereby leaving the collectingtubes14 in that particular cell suspended in a comparatively dead-air space.At the same time that the given cell is thus covered at the top thedust-receiver will span the lower end of the cell, and at the propertime the camblocks 2S and 29 and the cooperating springs 26 will imparta rapping motion to the tubes, thereby freeing the dust from within thetubes and permitting the same to drop onto the canvas 23 of thedust-receiver between the slats 22 thereof. As this rapping or shakingof the collecting-tubes occurs in a dead-air space or when the suctionis cut off, the same will be effective to free the dust and. clean thetube.

Of course it will be understood that many of the details of theconstruction might be changed Without departing from the spirit of myinvention. It is obvious, for example, that the springs 26 might bedispensed with and the gravity of the parts alone be relied upon to givethe desired drop and jar to the collecting-tubes. Many other changeswill readily suggest themselves to any one skilled in this line ofmachines.

It should perhaps be noted that while the suction-fan 7 is shown asmount-ed for delivering the clean air out into the room the same mightbe mounted, with proper piping, for returning the clean air to theproper point in the middlings-purifier. It should also be noted thatwhile the collectors 14 have been shown as of tubular form they might beof any other desired form. The tubular form, with the tubes of smalldiameter, is desirable, because the largest possible collecting-surfaceis thereby rendered available. The word tubes, therefore, as herein usedis intended to cover and include any and all forms of pockets orcollectors made up of flexible fabric of the proper material forcatching the dust, while permitting the air to pass therethrough. Itshould also have been noted that provision is made for preventing theair from passing from the main chamber 5 into the clean-air chamberwithout going through the collecting tubes and cells, which provision ismade, as shown, by plates or Walls 36, 37, and 38, as best shown inFig. 1. The said parts 36 and 37 close the passage which would otherwiseexist at the head of the series of cells outward of the travelingeut-olf device and dust-receiver, while the part 38 serves the samefunction at the foot of the series of IOO IIO

cells. Any other suitable means of support might be used, of course, forthe same purpose. It should also have been noted that the end walls 9avof the cells l0 are connected at their lower ends to the bottom platesll of said cells by canvas 39 or other suitable ilexible material whichwill permit the up-and.- down movement of said bottom plates andnevertheless keep the cell closed at its bottom, with the exception ofthe open lower ends of the collecting-tubes.

It may be here further stated as an obvious `modification that the lowerportion or mouth of the collecting-tube might itself be expanded andsecured to the Walls ofthe cell. I-Ience it will be understood that thestatement in the specification and in certain of the claims that thelower end of the cell is closed is used in the qualified sense that itis closed except for the passage through the open end of the collectingtube or tubes, as the case may be. It will also be understood that thestatement that the collecting-tubes are closed at one end does notnecessarily imply that they are closed by means of a board or airproofmateriahas shown in the drawings, but that the said expression is usedin a sense broad enough to include a tube which was closed by the samematerial of which the tube is formed.

It will be understood that as the tubes are agitated the cells in whichthey are contained remain stationary, and thus diminish the agitation ofthe air therein.

What I claim, and desire to secure by Letters Patent of the UnitedStates, is as follows:

l. In a dust-collector, the combination with a casing havingdust-receiving and clean-air chambers, said chambers being connectedtogether only through the intermediacy of a series of stationary cellsand dust-collecting tubes arranged in said cells, of means forinducing aforced circulation of air from the dust -chamber into the tubes andthence through the cells into the clean-air chamber, means forintermitting the passage of air through the tubes and cells, and meansfor jarring or shaking the tubes during the intermission in theair-current therethrough.

2. In adust-collector, the combination with a casing havingdust-receiving and clean-air chambers, said chambers being connectedtogether only through the intermediacy of a series of stationary cellsand dust-collecting tubes arranged in said cells, of a suction-fanlocated in the clean-air chamber and'operating to draw-air from thedust-chamber through the tubes and cells into its own chamber, mean`sfor intermittingly closing the cells and tubes against the passage ofair, and means for jarring or shaking the tubes during the intermissionin the air-passage to shake off the dust collected on the tubes.

3. In a dust-collector, the combination with a casing havingdust-receiving and clean-air chambers, said chambers being connectedtogether only through the intermediacy of a series of stationary cellshaving dust-collecting tubes arranged therein, of means for inducing aforced circulation of air from the dustchamber through the tubes andcells into the clean-air chamber, a traveling closure adaptedtointermittingly close the cells of said series in succession, and ashaker traveling in unisonwith said closure and operating tosuccessively jar the tubes of the closed cells and shake off the dustcollected thereon while said cells are closed.

4. In a dust-collector, the combination with a casing havingdust-receiving and clean-air chambers, said chambers being connectedtogether only through the intermediacy of a series of cells havingdust-collecting tubes arranged therein, of means for inducing a forcedcirculation of air from the dust-chamber to the clean-air chamberthrough the tubes and cells, means for intermitting the passage of theair through certain of said cells While the current is uninterrupted inothers, means for jarring the collecting-tubes in those cells only wherethe air is cut o, so as to shake Oi the dust in a dead-air space, and adust-receiver on which the dust is deposited by gravity.

5. In a dust-collector, the combination with a series of cells havingair-proof walls, which cells are normally open at one end and closed atthe other, of collecting tubes or pockets in said cells closed at oneend and mounted with their open ends forming passages through the closedends of said cells, means for forcing air through said tubes and cells,a traveling cut-od device mounted to move over the open ends of saidseries of cells, for cutting off the forced circulation of airtherethrough, in succession, and a traveling dust-receiver mounted tomove under the open ends of said tubes, for coperation with said cut-odevice, substantially as described.

6. In a dust-collector, the combination with a series of cells havingair-proof walls, which cells are normally open at their upper ends andare closed at their lower ends by flexible bottoms, of collecting tubesor pockets in said cells closed at their upper ends and mounted withtheir open lower ends forming passages through said iieXible bottoms ofsaid cells and secured thereto, means for forcing'air through said tubesand cells, a traveling cut-o device mounted to move over the upper oropen ends of said series of cells, a traveling dustreceiver mounted tomove under the open ends of said collecting-tubes, and means carried bysaid traveling dust-receiver for action on the flexible bottoms of saidcells to rap or jar the collecting-tubes, substantially as described.

In testimony whereof I aiiix my signature in presence of two witnesses.

EMIL R. DRAVER.- Witnesses:

JAs. F. WILLIAMsoN, C. F. KILGORE.

IOO

